drivers/target/iscsi/iscsi_target_nego.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * This file contains main functions related to iSCSI Parameter negotiation.
   4  *
   5  * (c) Copyright 2007-2013 Datera, Inc.
   6  *
   7  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   8  *
   9  ******************************************************************************/
  10
  11 #include <linux/ctype.h>
  12 #include <linux/kthread.h>
  13 #include <linux/slab.h>
  14 #include <linux/sched/signal.h>
  15 #include <net/sock.h>
  16 #include <scsi/iscsi_proto.h>
  17 #include <target/target_core_base.h>
  18 #include <target/target_core_fabric.h>
  19 #include <target/iscsi/iscsi_transport.h>
  20
  21 #include <target/iscsi/iscsi_target_core.h>
  22 #include "iscsi_target_parameters.h"
  23 #include "iscsi_target_login.h"
  24 #include "iscsi_target_nego.h"
  25 #include "iscsi_target_tpg.h"
  26 #include "iscsi_target_util.h"
  27 #include "iscsi_target.h"
  28 #include "iscsi_target_auth.h"
  29
  30 #define MAX_LOGIN_PDUS  7
  31 #define TEXT_LEN        4096
  32
  33 void convert_null_to_semi(char *buf, int len)
  34 {
  35         int i;
  36
  37         for (i = 0; i < len; i++)
  38                 if (buf[i] == '\0')
  39                         buf[i] = ';';
  40 }
  41
  42 static int strlen_semi(char *buf)
  43 {
  44         int i = 0;
  45
  46         while (buf[i] != '\0') {
  47                 if (buf[i] == ';')
  48                         return i;
  49                 i++;
  50         }
  51
  52         return -1;
  53 }
  54
  55 int extract_param(
  56         const char *in_buf,
  57         const char *pattern,
  58         unsigned int max_length,
  59         char *out_buf,
  60         unsigned char *type)
  61 {
  62         char *ptr;
  63         int len;
  64
  65         if (!in_buf || !pattern || !out_buf || !type)
  66                 return -1;
  67
  68         ptr = strstr(in_buf, pattern);
  69         if (!ptr)
  70                 return -1;
  71
  72         ptr = strstr(ptr, "=");
  73         if (!ptr)
  74                 return -1;
  75
  76         ptr += 1;
  77         if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
  78                 ptr += 2; /* skip 0x */
  79                 *type = HEX;
  80         } else
  81                 *type = DECIMAL;
  82
  83         len = strlen_semi(ptr);
  84         if (len < 0)
  85                 return -1;
  86
  87         if (len >= max_length) {
  88                 pr_err("Length of input: %d exceeds max_length:"
  89                         " %d\n", len, max_length);
  90                 return -1;
  91         }
  92         memcpy(out_buf, ptr, len);
  93         out_buf[len] = '\0';
  94
  95         return 0;
  96 }
  97
  98 static u32 iscsi_handle_authentication(
  99         struct iscsi_conn *conn,
 100         char *in_buf,
 101         char *out_buf,
 102         int in_length,
 103         int *out_length,
 104         unsigned char *authtype)
 105 {
 106         struct iscsi_session *sess = conn->sess;
 107         struct iscsi_node_auth *auth;
 108         struct iscsi_node_acl *iscsi_nacl;
 109         struct iscsi_portal_group *iscsi_tpg;
 110         struct se_node_acl *se_nacl;
 111
 112         if (!sess->sess_ops->SessionType) {
 113                 /*
 114                  * For SessionType=Normal
 115                  */
 116                 se_nacl = conn->sess->se_sess->se_node_acl;
 117                 if (!se_nacl) {
 118                         pr_err("Unable to locate struct se_node_acl for"
 119                                         " CHAP auth\n");
 120                         return -1;
 121                 }
 122                 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
 123                                 se_node_acl);
 124                 if (!iscsi_nacl) {
 125                         pr_err("Unable to locate struct iscsi_node_acl for"
 126                                         " CHAP auth\n");
 127                         return -1;
 128                 }
 129
 130                 if (se_nacl->dynamic_node_acl) {
 131                         iscsi_tpg = container_of(se_nacl->se_tpg,
 132                                         struct iscsi_portal_group, tpg_se_tpg);
 133
 134                         auth = &iscsi_tpg->tpg_demo_auth;
 135                 } else {
 136                         iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
 137                                                   se_node_acl);
 138
 139                         auth = &iscsi_nacl->node_auth;
 140                 }
 141         } else {
 142                 /*
 143                  * For SessionType=Discovery
 144                  */
 145                 auth = &iscsit_global->discovery_acl.node_auth;
 146         }
 147
 148         if (strstr("CHAP", authtype))
 149                 strcpy(conn->sess->auth_type, "CHAP");
 150         else
 151                 strcpy(conn->sess->auth_type, NONE);
 152
 153         if (strstr("None", authtype))
 154                 return 1;
 155         else if (strstr("CHAP", authtype))
 156                 return chap_main_loop(conn, auth, in_buf, out_buf,
 157                                 &in_length, out_length);
 158         /* SRP, SPKM1, SPKM2 and KRB5 are unsupported */
 159         return 2;
 160 }
 161
 162 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
 163 {
 164         kfree(conn->auth_protocol);
 165 }
 166
 167 int iscsi_target_check_login_request(
 168         struct iscsi_conn *conn,
 169         struct iscsi_login *login)
 170 {
 171         int req_csg, req_nsg;
 172         u32 payload_length;
 173         struct iscsi_login_req *login_req;
 174
 175         login_req = (struct iscsi_login_req *) login->req;
 176         payload_length = ntoh24(login_req->dlength);
 177
 178         switch (login_req->opcode & ISCSI_OPCODE_MASK) {
 179         case ISCSI_OP_LOGIN:
 180                 break;
 181         default:
 182                 pr_err("Received unknown opcode 0x%02x.\n",
 183                                 login_req->opcode & ISCSI_OPCODE_MASK);
 184                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 185                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 186                 return -1;
 187         }
 188
 189         if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
 190             (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 191                 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
 192                         " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
 193                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 194                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 195                 return -1;
 196         }
 197
 198         req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
 199         req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
 200
 201         if (req_csg != login->current_stage) {
 202                 pr_err("Initiator unexpectedly changed login stage"
 203                         " from %d to %d, login failed.\n", login->current_stage,
 204                         req_csg);
 205                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 206                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 207                 return -1;
 208         }
 209
 210         if ((req_nsg == 2) || (req_csg >= 2) ||
 211            ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
 212             (req_nsg <= req_csg))) {
 213                 pr_err("Illegal login_req->flags Combination, CSG: %d,"
 214                         " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
 215                         req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
 216                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 217                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 218                 return -1;
 219         }
 220
 221         if ((login_req->max_version != login->version_max) ||
 222             (login_req->min_version != login->version_min)) {
 223                 pr_err("Login request changed Version Max/Nin"
 224                         " unexpectedly to 0x%02x/0x%02x, protocol error\n",
 225                         login_req->max_version, login_req->min_version);
 226                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 227                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 228                 return -1;
 229         }
 230
 231         if (memcmp(login_req->isid, login->isid, 6) != 0) {
 232                 pr_err("Login request changed ISID unexpectedly,"
 233                                 " protocol error.\n");
 234                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 235                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 236                 return -1;
 237         }
 238
 239         if (login_req->itt != login->init_task_tag) {
 240                 pr_err("Login request changed ITT unexpectedly to"
 241                         " 0x%08x, protocol error.\n", login_req->itt);
 242                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 243                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 244                 return -1;
 245         }
 246
 247         if (payload_length > MAX_KEY_VALUE_PAIRS) {
 248                 pr_err("Login request payload exceeds default"
 249                         " MaxRecvDataSegmentLength: %u, protocol error.\n",
 250                                 MAX_KEY_VALUE_PAIRS);
 251                 return -1;
 252         }
 253
 254         return 0;
 255 }
 256 EXPORT_SYMBOL(iscsi_target_check_login_request);
 257
 258 static int iscsi_target_check_first_request(
 259         struct iscsi_conn *conn,
 260         struct iscsi_login *login)
 261 {
 262         struct iscsi_param *param = NULL;
 263         struct se_node_acl *se_nacl;
 264
 265         login->first_request = 0;
 266
 267         list_for_each_entry(param, &conn->param_list->param_list, p_list) {
 268                 if (!strncmp(param->name, SESSIONTYPE, 11)) {
 269                         if (!IS_PSTATE_ACCEPTOR(param)) {
 270                                 pr_err("SessionType key not received"
 271                                         " in first login request.\n");
 272                                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 273                                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 274                                 return -1;
 275                         }
 276                         if (!strncmp(param->value, DISCOVERY, 9))
 277                                 return 0;
 278                 }
 279
 280                 if (!strncmp(param->name, INITIATORNAME, 13)) {
 281                         if (!IS_PSTATE_ACCEPTOR(param)) {
 282                                 if (!login->leading_connection)
 283                                         continue;
 284
 285                                 pr_err("InitiatorName key not received"
 286                                         " in first login request.\n");
 287                                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 288                                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 289                                 return -1;
 290                         }
 291
 292                         /*
 293                          * For non-leading connections, double check that the
 294                          * received InitiatorName matches the existing session's
 295                          * struct iscsi_node_acl.
 296                          */
 297                         if (!login->leading_connection) {
 298                                 se_nacl = conn->sess->se_sess->se_node_acl;
 299                                 if (!se_nacl) {
 300                                         pr_err("Unable to locate"
 301                                                 " struct se_node_acl\n");
 302                                         iscsit_tx_login_rsp(conn,
 303                                                         ISCSI_STATUS_CLS_INITIATOR_ERR,
 304                                                         ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
 305                                         return -1;
 306                                 }
 307
 308                                 if (strcmp(param->value,
 309                                                 se_nacl->initiatorname)) {
 310                                         pr_err("Incorrect"
 311                                                 " InitiatorName: %s for this"
 312                                                 " iSCSI Initiator Node.\n",
 313                                                 param->value);
 314                                         iscsit_tx_login_rsp(conn,
 315                                                         ISCSI_STATUS_CLS_INITIATOR_ERR,
 316                                                         ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
 317                                         return -1;
 318                                 }
 319                         }
 320                 }
 321         }
 322
 323         return 0;
 324 }
 325
 326 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
 327 {
 328         u32 padding = 0;
 329         struct iscsi_login_rsp *login_rsp;
 330
 331         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 332
 333         login_rsp->opcode               = ISCSI_OP_LOGIN_RSP;
 334         hton24(login_rsp->dlength, login->rsp_length);
 335         memcpy(login_rsp->isid, login->isid, 6);
 336         login_rsp->tsih                 = cpu_to_be16(login->tsih);
 337         login_rsp->itt                  = login->init_task_tag;
 338         login_rsp->statsn               = cpu_to_be32(conn->stat_sn++);
 339         login_rsp->exp_cmdsn            = cpu_to_be32(conn->sess->exp_cmd_sn);
 340         login_rsp->max_cmdsn            = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
 341
 342         pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
 343                 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
 344                 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
 345                 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
 346                 ntohl(login_rsp->statsn), login->rsp_length);
 347
 348         padding = ((-login->rsp_length) & 3);
 349         /*
 350          * Before sending the last login response containing the transition
 351          * bit for full-feature-phase, go ahead and start up TX/RX threads
 352          * now to avoid potential resource allocation failures after the
 353          * final login response has been sent.
 354          */
 355         if (login->login_complete) {
 356                 int rc = iscsit_start_kthreads(conn);
 357                 if (rc) {
 358                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 359                                             ISCSI_LOGIN_STATUS_NO_RESOURCES);
 360                         return -1;
 361                 }
 362         }
 363
 364         if (conn->conn_transport->iscsit_put_login_tx(conn, login,
 365                                         login->rsp_length + padding) < 0)
 366                 goto err;
 367
 368         login->rsp_length               = 0;
 369
 370         return 0;
 371
 372 err:
 373         if (login->login_complete) {
 374                 if (conn->rx_thread && conn->rx_thread_active) {
 375                         send_sig(SIGINT, conn->rx_thread, 1);
 376                         complete(&conn->rx_login_comp);
 377                         kthread_stop(conn->rx_thread);
 378                 }
 379                 if (conn->tx_thread && conn->tx_thread_active) {
 380                         send_sig(SIGINT, conn->tx_thread, 1);
 381                         kthread_stop(conn->tx_thread);
 382                 }
 383                 spin_lock(&iscsit_global->ts_bitmap_lock);
 384                 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 385                                       get_order(1));
 386                 spin_unlock(&iscsit_global->ts_bitmap_lock);
 387         }
 388         return -1;
 389 }
 390
 391 static void iscsi_target_sk_data_ready(struct sock *sk)
 392 {
 393         struct iscsi_conn *conn = sk->sk_user_data;
 394         bool rc;
 395
 396         pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
 397
 398         write_lock_bh(&sk->sk_callback_lock);
 399         if (!sk->sk_user_data) {
 400                 write_unlock_bh(&sk->sk_callback_lock);
 401                 return;
 402         }
 403         if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
 404                 write_unlock_bh(&sk->sk_callback_lock);
 405                 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
 406                 return;
 407         }
 408         if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
 409                 write_unlock_bh(&sk->sk_callback_lock);
 410                 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
 411                 return;
 412         }
 413         if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
 414                 write_unlock_bh(&sk->sk_callback_lock);
 415                 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
 416                 if (iscsi_target_sk_data_ready == conn->orig_data_ready)
 417                         return;
 418                 conn->orig_data_ready(sk);
 419                 return;
 420         }
 421
 422         rc = schedule_delayed_work(&conn->login_work, 0);
 423         if (!rc) {
 424                 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
 425                          " got false\n");
 426         }
 427         write_unlock_bh(&sk->sk_callback_lock);
 428 }
 429
 430 static void iscsi_target_sk_state_change(struct sock *);
 431
 432 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
 433 {
 434         struct sock *sk;
 435
 436         if (!conn->sock)
 437                 return;
 438
 439         sk = conn->sock->sk;
 440         pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
 441
 442         write_lock_bh(&sk->sk_callback_lock);
 443         sk->sk_user_data = conn;
 444         conn->orig_data_ready = sk->sk_data_ready;
 445         conn->orig_state_change = sk->sk_state_change;
 446         sk->sk_data_ready = iscsi_target_sk_data_ready;
 447         sk->sk_state_change = iscsi_target_sk_state_change;
 448         write_unlock_bh(&sk->sk_callback_lock);
 449
 450         sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
 451         sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
 452 }
 453
 454 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
 455 {
 456         struct sock *sk;
 457
 458         if (!conn->sock)
 459                 return;
 460
 461         sk = conn->sock->sk;
 462         pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
 463
 464         write_lock_bh(&sk->sk_callback_lock);
 465         if (!sk->sk_user_data) {
 466                 write_unlock_bh(&sk->sk_callback_lock);
 467                 return;
 468         }
 469         sk->sk_user_data = NULL;
 470         sk->sk_data_ready = conn->orig_data_ready;
 471         sk->sk_state_change = conn->orig_state_change;
 472         write_unlock_bh(&sk->sk_callback_lock);
 473
 474         sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
 475         sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
 476 }
 477
 478 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
 479
 480 static bool __iscsi_target_sk_check_close(struct sock *sk)
 481 {
 482         if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
 483                 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
 484                         "returning FALSE\n");
 485                 return true;
 486         }
 487         return false;
 488 }
 489
 490 static bool iscsi_target_sk_check_close(struct iscsi_conn *conn)
 491 {
 492         bool state = false;
 493
 494         if (conn->sock) {
 495                 struct sock *sk = conn->sock->sk;
 496
 497                 read_lock_bh(&sk->sk_callback_lock);
 498                 state = (__iscsi_target_sk_check_close(sk) ||
 499                          test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
 500                 read_unlock_bh(&sk->sk_callback_lock);
 501         }
 502         return state;
 503 }
 504
 505 static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag)
 506 {
 507         bool state = false;
 508
 509         if (conn->sock) {
 510                 struct sock *sk = conn->sock->sk;
 511
 512                 read_lock_bh(&sk->sk_callback_lock);
 513                 state = test_bit(flag, &conn->login_flags);
 514                 read_unlock_bh(&sk->sk_callback_lock);
 515         }
 516         return state;
 517 }
 518
 519 static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag)
 520 {
 521         bool state = false;
 522
 523         if (conn->sock) {
 524                 struct sock *sk = conn->sock->sk;
 525
 526                 write_lock_bh(&sk->sk_callback_lock);
 527                 state = (__iscsi_target_sk_check_close(sk) ||
 528                          test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
 529                 if (!state)
 530                         clear_bit(flag, &conn->login_flags);
 531                 write_unlock_bh(&sk->sk_callback_lock);
 532         }
 533         return state;
 534 }
 535
 536 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
 537 {
 538         struct iscsi_np *np = login->np;
 539         bool zero_tsih = login->zero_tsih;
 540
 541         iscsi_remove_failed_auth_entry(conn);
 542         iscsi_target_nego_release(conn);
 543         iscsi_target_login_sess_out(conn, np, zero_tsih, true);
 544 }
 545
 546 struct conn_timeout {
 547         struct timer_list timer;
 548         struct iscsi_conn *conn;
 549 };
 550
 551 static void iscsi_target_login_timeout(struct timer_list *t)
 552 {
 553         struct conn_timeout *timeout = from_timer(timeout, t, timer);
 554         struct iscsi_conn *conn = timeout->conn;
 555
 556         pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
 557
 558         if (conn->login_kworker) {
 559                 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
 560                          conn->login_kworker->comm, conn->login_kworker->pid);
 561                 send_sig(SIGINT, conn->login_kworker, 1);
 562         }
 563 }
 564
 565 static void iscsi_target_do_login_rx(struct work_struct *work)
 566 {
 567         struct iscsi_conn *conn = container_of(work,
 568                                 struct iscsi_conn, login_work.work);
 569         struct iscsi_login *login = conn->login;
 570         struct iscsi_np *np = login->np;
 571         struct iscsi_portal_group *tpg = conn->tpg;
 572         struct iscsi_tpg_np *tpg_np = conn->tpg_np;
 573         struct conn_timeout timeout;
 574         int rc, zero_tsih = login->zero_tsih;
 575         bool state;
 576
 577         pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
 578                         conn, current->comm, current->pid);
 579         /*
 580          * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
 581          * before initial PDU processing in iscsi_target_start_negotiation()
 582          * has completed, go ahead and retry until it's cleared.
 583          *
 584          * Otherwise if the TCP connection drops while this is occuring,
 585          * iscsi_target_start_negotiation() will detect the failure, call
 586          * cancel_delayed_work_sync(&conn->login_work), and cleanup the
 587          * remaining iscsi connection resources from iscsi_np process context.
 588          */
 589         if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
 590                 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
 591                 return;
 592         }
 593
 594         spin_lock(&tpg->tpg_state_lock);
 595         state = (tpg->tpg_state == TPG_STATE_ACTIVE);
 596         spin_unlock(&tpg->tpg_state_lock);
 597
 598         if (!state) {
 599                 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
 600                 goto err;
 601         }
 602
 603         if (iscsi_target_sk_check_close(conn)) {
 604                 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
 605                 goto err;
 606         }
 607
 608         conn->login_kworker = current;
 609         allow_signal(SIGINT);
 610
 611         timeout.conn = conn;
 612         timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0);
 613         mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
 614         pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid);
 615
 616         rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
 617         del_timer_sync(&timeout.timer);
 618         destroy_timer_on_stack(&timeout.timer);
 619         flush_signals(current);
 620         conn->login_kworker = NULL;
 621
 622         if (rc < 0)
 623                 goto err;
 624
 625         pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
 626                         conn, current->comm, current->pid);
 627
 628         rc = iscsi_target_do_login(conn, login);
 629         if (rc < 0) {
 630                 goto err;
 631         } else if (!rc) {
 632                 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE))
 633                         goto err;
 634         } else if (rc == 1) {
 635                 iscsi_target_nego_release(conn);
 636                 iscsi_post_login_handler(np, conn, zero_tsih);
 637                 iscsit_deaccess_np(np, tpg, tpg_np);
 638         }
 639         return;
 640
 641 err:
 642         iscsi_target_restore_sock_callbacks(conn);
 643         iscsi_target_login_drop(conn, login);
 644         iscsit_deaccess_np(np, tpg, tpg_np);
 645 }
 646
 647 static void iscsi_target_sk_state_change(struct sock *sk)
 648 {
 649         struct iscsi_conn *conn;
 650         void (*orig_state_change)(struct sock *);
 651         bool state;
 652
 653         pr_debug("Entering iscsi_target_sk_state_change\n");
 654
 655         write_lock_bh(&sk->sk_callback_lock);
 656         conn = sk->sk_user_data;
 657         if (!conn) {
 658                 write_unlock_bh(&sk->sk_callback_lock);
 659                 return;
 660         }
 661         orig_state_change = conn->orig_state_change;
 662
 663         if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
 664                 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
 665                          conn);
 666                 write_unlock_bh(&sk->sk_callback_lock);
 667                 orig_state_change(sk);
 668                 return;
 669         }
 670         state = __iscsi_target_sk_check_close(sk);
 671         pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
 672
 673         if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
 674                 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
 675                          " conn: %p\n", conn);
 676                 if (state)
 677                         set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
 678                 write_unlock_bh(&sk->sk_callback_lock);
 679                 orig_state_change(sk);
 680                 return;
 681         }
 682         if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
 683                 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
 684                          conn);
 685                 write_unlock_bh(&sk->sk_callback_lock);
 686                 orig_state_change(sk);
 687                 return;
 688         }
 689         /*
 690          * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
 691          * but only queue conn->login_work -> iscsi_target_do_login_rx()
 692          * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
 693          *
 694          * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
 695          * will detect the dropped TCP connection from delayed workqueue context.
 696          *
 697          * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
 698          * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
 699          * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
 700          * via iscsi_target_sk_check_and_clear() is responsible for detecting the
 701          * dropped TCP connection in iscsi_np process context, and cleaning up
 702          * the remaining iscsi connection resources.
 703          */
 704         if (state) {
 705                 pr_debug("iscsi_target_sk_state_change got failed state\n");
 706                 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
 707                 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
 708                 write_unlock_bh(&sk->sk_callback_lock);
 709
 710                 orig_state_change(sk);
 711
 712                 if (!state)
 713                         schedule_delayed_work(&conn->login_work, 0);
 714                 return;
 715         }
 716         write_unlock_bh(&sk->sk_callback_lock);
 717
 718         orig_state_change(sk);
 719 }
 720
 721 /*
 722  *      NOTE: We check for existing sessions or connections AFTER the initiator
 723  *      has been successfully authenticated in order to protect against faked
 724  *      ISID/TSIH combinations.
 725  */
 726 static int iscsi_target_check_for_existing_instances(
 727         struct iscsi_conn *conn,
 728         struct iscsi_login *login)
 729 {
 730         if (login->checked_for_existing)
 731                 return 0;
 732
 733         login->checked_for_existing = 1;
 734
 735         if (!login->tsih)
 736                 return iscsi_check_for_session_reinstatement(conn);
 737         else
 738                 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
 739                                 login->initial_exp_statsn);
 740 }
 741
 742 static int iscsi_target_do_authentication(
 743         struct iscsi_conn *conn,
 744         struct iscsi_login *login)
 745 {
 746         int authret;
 747         u32 payload_length;
 748         struct iscsi_param *param;
 749         struct iscsi_login_req *login_req;
 750         struct iscsi_login_rsp *login_rsp;
 751
 752         login_req = (struct iscsi_login_req *) login->req;
 753         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 754         payload_length = ntoh24(login_req->dlength);
 755
 756         param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
 757         if (!param)
 758                 return -1;
 759
 760         authret = iscsi_handle_authentication(
 761                         conn,
 762                         login->req_buf,
 763                         login->rsp_buf,
 764                         payload_length,
 765                         &login->rsp_length,
 766                         param->value);
 767         switch (authret) {
 768         case 0:
 769                 pr_debug("Received OK response"
 770                 " from LIO Authentication, continuing.\n");
 771                 break;
 772         case 1:
 773                 pr_debug("iSCSI security negotiation"
 774                         " completed successfully.\n");
 775                 login->auth_complete = 1;
 776                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
 777                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 778                         login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
 779                                              ISCSI_FLAG_LOGIN_TRANSIT);
 780                         login->current_stage = 1;
 781                 }
 782                 return iscsi_target_check_for_existing_instances(
 783                                 conn, login);
 784         case 2:
 785                 pr_err("Security negotiation"
 786                         " failed.\n");
 787                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 788                                 ISCSI_LOGIN_STATUS_AUTH_FAILED);
 789                 return -1;
 790         default:
 791                 pr_err("Received unknown error %d from LIO"
 792                                 " Authentication\n", authret);
 793                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 794                                 ISCSI_LOGIN_STATUS_TARGET_ERROR);
 795                 return -1;
 796         }
 797
 798         return 0;
 799 }
 800
 801 static int iscsi_target_handle_csg_zero(
 802         struct iscsi_conn *conn,
 803         struct iscsi_login *login)
 804 {
 805         int ret;
 806         u32 payload_length;
 807         struct iscsi_param *param;
 808         struct iscsi_login_req *login_req;
 809         struct iscsi_login_rsp *login_rsp;
 810
 811         login_req = (struct iscsi_login_req *) login->req;
 812         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 813         payload_length = ntoh24(login_req->dlength);
 814
 815         param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
 816         if (!param)
 817                 return -1;
 818
 819         ret = iscsi_decode_text_input(
 820                         PHASE_SECURITY|PHASE_DECLARATIVE,
 821                         SENDER_INITIATOR|SENDER_RECEIVER,
 822                         login->req_buf,
 823                         payload_length,
 824                         conn);
 825         if (ret < 0)
 826                 return -1;
 827
 828         if (ret > 0) {
 829                 if (login->auth_complete) {
 830                         pr_err("Initiator has already been"
 831                                 " successfully authenticated, but is still"
 832                                 " sending %s keys.\n", param->value);
 833                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 834                                         ISCSI_LOGIN_STATUS_INIT_ERR);
 835                         return -1;
 836                 }
 837
 838                 goto do_auth;
 839         } else if (!payload_length) {
 840                 pr_err("Initiator sent zero length security payload,"
 841                        " login failed\n");
 842                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 843                                     ISCSI_LOGIN_STATUS_AUTH_FAILED);
 844                 return -1;
 845         }
 846
 847         if (login->first_request)
 848                 if (iscsi_target_check_first_request(conn, login) < 0)
 849                         return -1;
 850
 851         ret = iscsi_encode_text_output(
 852                         PHASE_SECURITY|PHASE_DECLARATIVE,
 853                         SENDER_TARGET,
 854                         login->rsp_buf,
 855                         &login->rsp_length,
 856                         conn->param_list,
 857                         conn->tpg->tpg_attrib.login_keys_workaround);
 858         if (ret < 0)
 859                 return -1;
 860
 861         if (!iscsi_check_negotiated_keys(conn->param_list)) {
 862                 if (conn->tpg->tpg_attrib.authentication &&
 863                     !strncmp(param->value, NONE, 4)) {
 864                         pr_err("Initiator sent AuthMethod=None but"
 865                                 " Target is enforcing iSCSI Authentication,"
 866                                         " login failed.\n");
 867                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 868                                         ISCSI_LOGIN_STATUS_AUTH_FAILED);
 869                         return -1;
 870                 }
 871
 872                 if (conn->tpg->tpg_attrib.authentication &&
 873                     !login->auth_complete)
 874                         return 0;
 875
 876                 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
 877                         return 0;
 878
 879                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
 880                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 881                         login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
 882                                             ISCSI_FLAG_LOGIN_TRANSIT;
 883                         login->current_stage = 1;
 884                 }
 885         }
 886
 887         return 0;
 888 do_auth:
 889         return iscsi_target_do_authentication(conn, login);
 890 }
 891
 892 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
 893 {
 894         int ret;
 895         u32 payload_length;
 896         struct iscsi_login_req *login_req;
 897         struct iscsi_login_rsp *login_rsp;
 898
 899         login_req = (struct iscsi_login_req *) login->req;
 900         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 901         payload_length = ntoh24(login_req->dlength);
 902
 903         ret = iscsi_decode_text_input(
 904                         PHASE_OPERATIONAL|PHASE_DECLARATIVE,
 905                         SENDER_INITIATOR|SENDER_RECEIVER,
 906                         login->req_buf,
 907                         payload_length,
 908                         conn);
 909         if (ret < 0) {
 910                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 911                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 912                 return -1;
 913         }
 914
 915         if (login->first_request)
 916                 if (iscsi_target_check_first_request(conn, login) < 0)
 917                         return -1;
 918
 919         if (iscsi_target_check_for_existing_instances(conn, login) < 0)
 920                 return -1;
 921
 922         ret = iscsi_encode_text_output(
 923                         PHASE_OPERATIONAL|PHASE_DECLARATIVE,
 924                         SENDER_TARGET,
 925                         login->rsp_buf,
 926                         &login->rsp_length,
 927                         conn->param_list,
 928                         conn->tpg->tpg_attrib.login_keys_workaround);
 929         if (ret < 0) {
 930                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 931                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 932                 return -1;
 933         }
 934
 935         if (!login->auth_complete &&
 936              conn->tpg->tpg_attrib.authentication) {
 937                 pr_err("Initiator is requesting CSG: 1, has not been"
 938                          " successfully authenticated, and the Target is"
 939                         " enforcing iSCSI Authentication, login failed.\n");
 940                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 941                                 ISCSI_LOGIN_STATUS_AUTH_FAILED);
 942                 return -1;
 943         }
 944
 945         if (!iscsi_check_negotiated_keys(conn->param_list))
 946                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
 947                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
 948                         login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
 949                                             ISCSI_FLAG_LOGIN_TRANSIT;
 950
 951         return 0;
 952 }
 953
 954 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
 955 {
 956         int pdu_count = 0;
 957         struct iscsi_login_req *login_req;
 958         struct iscsi_login_rsp *login_rsp;
 959
 960         login_req = (struct iscsi_login_req *) login->req;
 961         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 962
 963         while (1) {
 964                 if (++pdu_count > MAX_LOGIN_PDUS) {
 965                         pr_err("MAX_LOGIN_PDUS count reached.\n");
 966                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 967                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
 968                         return -1;
 969                 }
 970
 971                 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
 972                 case 0:
 973                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
 974                         if (iscsi_target_handle_csg_zero(conn, login) < 0)
 975                                 return -1;
 976                         break;
 977                 case 1:
 978                         login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
 979                         if (iscsi_target_handle_csg_one(conn, login) < 0)
 980                                 return -1;
 981                         if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
 982                                 /*
 983                                  * Check to make sure the TCP connection has not
 984                                  * dropped asynchronously while session reinstatement
 985                                  * was occuring in this kthread context, before
 986                                  * transitioning to full feature phase operation.
 987                                  */
 988                                 if (iscsi_target_sk_check_close(conn))
 989                                         return -1;
 990
 991                                 login->tsih = conn->sess->tsih;
 992                                 login->login_complete = 1;
 993                                 iscsi_target_restore_sock_callbacks(conn);
 994                                 if (iscsi_target_do_tx_login_io(conn,
 995                                                 login) < 0)
 996                                         return -1;
 997                                 return 1;
 998                         }
 999                         break;
1000                 default:
1001                         pr_err("Illegal CSG: %d received from"
1002                                 " Initiator, protocol error.\n",
1003                                 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1004                         break;
1005                 }
1006
1007                 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1008                         return -1;
1009
1010                 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1011                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1012                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1013                 }
1014                 break;
1015         }
1016
1017         return 0;
1018 }
1019
1020 static void iscsi_initiatorname_tolower(
1021         char *param_buf)
1022 {
1023         char *c;
1024         u32 iqn_size = strlen(param_buf), i;
1025
1026         for (i = 0; i < iqn_size; i++) {
1027                 c = &param_buf[i];
1028                 if (!isupper(*c))
1029                         continue;
1030
1031                 *c = tolower(*c);
1032         }
1033 }
1034
1035 /*
1036  * Processes the first Login Request..
1037  */
1038 int iscsi_target_locate_portal(
1039         struct iscsi_np *np,
1040         struct iscsi_conn *conn,
1041         struct iscsi_login *login)
1042 {
1043         char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1044         char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1045         struct iscsi_session *sess = conn->sess;
1046         struct iscsi_tiqn *tiqn;
1047         struct iscsi_tpg_np *tpg_np = NULL;
1048         struct iscsi_login_req *login_req;
1049         struct se_node_acl *se_nacl;
1050         u32 payload_length, queue_depth = 0;
1051         int sessiontype = 0, ret = 0, tag_num, tag_size;
1052
1053         INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1054         iscsi_target_set_sock_callbacks(conn);
1055
1056         login->np = np;
1057
1058         login_req = (struct iscsi_login_req *) login->req;
1059         payload_length = ntoh24(login_req->dlength);
1060
1061         tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1062         if (!tmpbuf) {
1063                 pr_err("Unable to allocate memory for tmpbuf.\n");
1064                 return -1;
1065         }
1066
1067         memcpy(tmpbuf, login->req_buf, payload_length);
1068         tmpbuf[payload_length] = '\0';
1069         start = tmpbuf;
1070         end = (start + payload_length);
1071
1072         /*
1073          * Locate the initial keys expected from the Initiator node in
1074          * the first login request in order to progress with the login phase.
1075          */
1076         while (start < end) {
1077                 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1078                         ret = -1;
1079                         goto out;
1080                 }
1081
1082                 if (!strncmp(key, "InitiatorName", 13))
1083                         i_buf = value;
1084                 else if (!strncmp(key, "SessionType", 11))
1085                         s_buf = value;
1086                 else if (!strncmp(key, "TargetName", 10))
1087                         t_buf = value;
1088
1089                 start += strlen(key) + strlen(value) + 2;
1090         }
1091         /*
1092          * See 5.3.  Login Phase.
1093          */
1094         if (!i_buf) {
1095                 pr_err("InitiatorName key not received"
1096                         " in first login request.\n");
1097                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1098                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1099                 ret = -1;
1100                 goto out;
1101         }
1102         /*
1103          * Convert the incoming InitiatorName to lowercase following
1104          * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1105          * are NOT case sensitive.
1106          */
1107         iscsi_initiatorname_tolower(i_buf);
1108
1109         if (!s_buf) {
1110                 if (!login->leading_connection)
1111                         goto get_target;
1112
1113                 pr_err("SessionType key not received"
1114                         " in first login request.\n");
1115                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1116                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1117                 ret = -1;
1118                 goto out;
1119         }
1120
1121         /*
1122          * Use default portal group for discovery sessions.
1123          */
1124         sessiontype = strncmp(s_buf, DISCOVERY, 9);
1125         if (!sessiontype) {
1126                 conn->tpg = iscsit_global->discovery_tpg;
1127                 if (!login->leading_connection)
1128                         goto get_target;
1129
1130                 sess->sess_ops->SessionType = 1;
1131                 /*
1132                  * Setup crc32c modules from libcrypto
1133                  */
1134                 if (iscsi_login_setup_crypto(conn) < 0) {
1135                         pr_err("iscsi_login_setup_crypto() failed\n");
1136                         ret = -1;
1137                         goto out;
1138                 }
1139                 /*
1140                  * Serialize access across the discovery struct iscsi_portal_group to
1141                  * process login attempt.
1142                  */
1143                 if (iscsit_access_np(np, conn->tpg) < 0) {
1144                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1145                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1146                         ret = -1;
1147                         goto out;
1148                 }
1149                 ret = 0;
1150                 goto alloc_tags;
1151         }
1152
1153 get_target:
1154         if (!t_buf) {
1155                 pr_err("TargetName key not received"
1156                         " in first login request while"
1157                         " SessionType=Normal.\n");
1158                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1159                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1160                 ret = -1;
1161                 goto out;
1162         }
1163
1164         /*
1165          * Locate Target IQN from Storage Node.
1166          */
1167         tiqn = iscsit_get_tiqn_for_login(t_buf);
1168         if (!tiqn) {
1169                 pr_err("Unable to locate Target IQN: %s in"
1170                         " Storage Node\n", t_buf);
1171                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1172                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1173                 ret = -1;
1174                 goto out;
1175         }
1176         pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1177
1178         /*
1179          * Locate Target Portal Group from Storage Node.
1180          */
1181         conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1182         if (!conn->tpg) {
1183                 pr_err("Unable to locate Target Portal Group"
1184                                 " on %s\n", tiqn->tiqn);
1185                 iscsit_put_tiqn_for_login(tiqn);
1186                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1187                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1188                 ret = -1;
1189                 goto out;
1190         }
1191         conn->tpg_np = tpg_np;
1192         pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1193         /*
1194          * Setup crc32c modules from libcrypto
1195          */
1196         if (iscsi_login_setup_crypto(conn) < 0) {
1197                 pr_err("iscsi_login_setup_crypto() failed\n");
1198                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1199                 iscsit_put_tiqn_for_login(tiqn);
1200                 conn->tpg = NULL;
1201                 ret = -1;
1202                 goto out;
1203         }
1204         /*
1205          * Serialize access across the struct iscsi_portal_group to
1206          * process login attempt.
1207          */
1208         if (iscsit_access_np(np, conn->tpg) < 0) {
1209                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1210                 iscsit_put_tiqn_for_login(tiqn);
1211                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1212                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1213                 conn->tpg = NULL;
1214                 ret = -1;
1215                 goto out;
1216         }
1217
1218         /*
1219          * conn->sess->node_acl will be set when the referenced
1220          * struct iscsi_session is located from received ISID+TSIH in
1221          * iscsi_login_non_zero_tsih_s2().
1222          */
1223         if (!login->leading_connection) {
1224                 ret = 0;
1225                 goto out;
1226         }
1227
1228         /*
1229          * This value is required in iscsi_login_zero_tsih_s2()
1230          */
1231         sess->sess_ops->SessionType = 0;
1232
1233         /*
1234          * Locate incoming Initiator IQN reference from Storage Node.
1235          */
1236         sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1237                         &conn->tpg->tpg_se_tpg, i_buf);
1238         if (!sess->se_sess->se_node_acl) {
1239                 pr_err("iSCSI Initiator Node: %s is not authorized to"
1240                         " access iSCSI target portal group: %hu.\n",
1241                                 i_buf, conn->tpg->tpgt);
1242                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1243                                 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1244                 ret = -1;
1245                 goto out;
1246         }
1247         se_nacl = sess->se_sess->se_node_acl;
1248         queue_depth = se_nacl->queue_depth;
1249         /*
1250          * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1251          * depth for non immediate commands, plus extra tags for immediate
1252          * commands.
1253          *
1254          * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1255          * in per-cpu-ida tag allocation logic + small queue_depth.
1256          */
1257 alloc_tags:
1258         tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1259         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1260         tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1261
1262         ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1263         if (ret < 0) {
1264                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1265                                     ISCSI_LOGIN_STATUS_NO_RESOURCES);
1266                 ret = -1;
1267         }
1268 out:
1269         kfree(tmpbuf);
1270         return ret;
1271 }
1272
1273 int iscsi_target_start_negotiation(
1274         struct iscsi_login *login,
1275         struct iscsi_conn *conn)
1276 {
1277         int ret;
1278
1279         if (conn->sock) {
1280                 struct sock *sk = conn->sock->sk;
1281
1282                 write_lock_bh(&sk->sk_callback_lock);
1283                 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1284                 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1285                 write_unlock_bh(&sk->sk_callback_lock);
1286         }
1287         /*
1288          * If iscsi_target_do_login returns zero to signal more PDU
1289          * exchanges are required to complete the login, go ahead and
1290          * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1291          * is still active.
1292          *
1293          * Otherwise if TCP connection dropped asynchronously, go ahead
1294          * and perform connection cleanup now.
1295          */
1296         ret = iscsi_target_do_login(conn, login);
1297         if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1298                 ret = -1;
1299
1300         if (ret < 0) {
1301                 cancel_delayed_work_sync(&conn->login_work);
1302                 iscsi_target_restore_sock_callbacks(conn);
1303                 iscsi_remove_failed_auth_entry(conn);
1304         }
1305         if (ret != 0)
1306                 iscsi_target_nego_release(conn);
1307
1308         return ret;
1309 }
1310
1311 void iscsi_target_nego_release(struct iscsi_conn *conn)
1312 {
1313         struct iscsi_login *login = conn->conn_login;
1314
1315         if (!login)
1316                 return;
1317
1318         kfree(login->req_buf);
1319         kfree(login->rsp_buf);
1320         kfree(login);
1321
1322         conn->conn_login = NULL;
1323 }